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POconvert blob to clob
 

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    <p>I'm using oracle 11g and I'm trying to find out the length of a text. I will normally use select length(myvar) from table, but I can't do that.</p> <p>The table which I want to query has a BLOB column that saves characters or photos. I want to know the number of characters that have my BLOB column.</p> <p>I tried to convert my BLOB into a char using UTL_RAW.CAST_TO_VARCHAR2(myblob) from table, but this functions isnt't working correctly or maybe I'm making a mistake. </p> <p>For example: My BLOB have the word Section, when I see this in the databse in the hexadecimal form I see S.e.c.t.i.o.n.. I dont'k know why it have those points in between each letter. Then I used the this query </p> <pre><code>select UTL_RAW.CAST_TO_VARCHAR2(myblob) from table </code></pre> <p>The result of this query is 'S' so it's not the complete word that my BLOB has, and when I make this query</p> <pre><code>select length(UTL_RAW.CAST_TO_VARCHAR2(myblob)) from table </code></pre> <p>the result is 18 and the word Sections doesn't have 18 characters.</p> <p>I was trying to convert the blob into a varchar, although I think my best choise would be a clob because the length of the text that it can save is more than the limit that varchar has. I tried to do that by making this query (I'm not sure if this is correct but is what I found in the internet)</p> <pre><code>select UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(myblob, 32767, 1)) from table </code></pre> <p>This query also returns 'S' </p> <p>I hope you can help me with this problem. thanks for advanced</p>
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    1. USJ. Steen
    1. USuser1739469
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      1. USJon Heller
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    1. CODBMS_LOB.GET_LENGTH() may help
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      1. UScagcowboy
    2. COWelcome to the wonderful world of variable length character encodings
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      1. USMike Park
    3. CO@cagcowboy I tried using select DBMS_LOB.GET_LENGTH(myblob) from table but I get an error. ORA-00904 invalid identifier.
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